摘要
针对近距离多重滑动构造三软煤层回采巷道变形破坏严重支护困难的问题,采用相似模拟实验与现场调研监测相结合的研究方法,研究了多重滑动构造三软煤层回采巷道上覆岩层运动特征与回采过程中巷道围岩应力分布规律,提出了多重滑动构造三软煤层回采巷道基本支护方案。研究结果表明,在滑动构造影响下,上覆岩层随着工作面不断推进产生裂隙至裂隙叠加发展至不同岩体之间开始产生离层,随后呈台阶式下沉垮落;巷道顶板的初次来压步距为20 m,周期来压步距为15 m,顶板的最终破断形式为台阶式;巷道主应力为水平应力,应力集中出现在巷道的上下两帮,受滑动构造的影响,巷道围岩应力集中不均匀表现为上帮应力集中程度大于下帮;滑动构造影响下,巷道顶底板围岩破碎且围岩变形呈现明显的方向性,巷道上帮的变形量大于下帮;采用U型钢棚+锚索联合支护能够有效控制巷道围岩变形。
For the problem that the gateway with multiple sliding structure in close distance was severely damaged and difficult to support,the research method combining similar simulation experiment with field investigation monitoring was adopted,the movement characteristics of overlying strata and the stress distribution law of surrounding rock in the mining process were studied in the gateway with multiple sliding structure and"Three Soft"coal seams,and the basic supporting scheme of gateway in multiple sliding structures with"Three Soft"coal seams was proposed.The research results indicate that under the influence of sliding structures,the overlying rock strata generate cracks as the working face continues to advance,and the cracks overlap and develop to separate layers between different rock masses,followed by a stepped subsidence and collapse.The initial pressure step distance of the roadway roof is 20 meters,the periodic pressure step distance is 15 meters,and the final breaking form of the roof is stepped.The main roadway stress is horizontal,and the stress concentration occurs in the upper and lower sides of the gateway.Due to the influence of sliding structures,the uneven stress concentration in the surrounding rock of the roadway is manifested as the degree of stress concentration in the upper side being greater than that in the lower side.Under the influence of sliding structures,the surrounding rock on the top and bottom of the roadway is broken and the deformation of the surrounding rock shows obvious directionality,with the deformation in the upper side of the gateway generally greater than that in the lower side.The combination of U-shaped steel shed and anchor cable supporting can effectively control the deformation of the surrounding rock of the tunnel.
作者
苏金华
任金武
张继远
田孟含
张盼
辛亚军
吴春浩
Su Jinhua;Ren Jinwu;Zhang Jiyuan;Tian Menghan;Zhang Pan;Xin Yajun;Wu Chunhao(Yonghua Energy Co.,Ltd.,Henan Energy Group,Luoyang 471000,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo 454000,China)
出处
《能源与环保》
2023年第9期279-284,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家自然科学基金资助项目(51374091,51674101)
河南省重点研发与推广专项(科技攻关)资助项目(232102321132)。
关键词
滑动构造
三软煤层
回采巷道
覆岩运动
应力分布
围岩控制
sliding structure
"Three Soft"coal seam
gateway
overburden movement
stress distribution
surrounding rock control
